designation
txn2 is an open source organization for components developed by Craig Johnston, sponsored by Deasil Works, Inc. and Plexara. Model Context Protocol servers, CLI tools, and Go libraries across the modern data stack, Kubernetes networking, and host‑file management.
§ 01 / model context protocol servers
Model Context Protocol servers exposing object storage, distributed SQL engines, and metadata catalogs to MCP-capable clients.
platform
An AI assistant can run SQL, but it doesn't know that cust_id is PII, that the table was deprecated last month, or who to ask when something breaks. mcp-data-platform fixes that. It connects assistants to your data infrastructure and adds business context from your semantic layer. Query a Trino table and get its meaning, owners, quality scores, and deprecation warnings in the same response.
mcp-datahub, mcp-s3, and mcp-trino behind a single endpoint
flowchart TD
Client["mcp-capable
llm / agent"]
Platform["mcp-data-platform"]
S3["mcp-s3"]
Trino["mcp-trino"]
DH["mcp-datahub"]
Mem["memory
insight capture"]
Client ==>|MCP| Platform
Platform --> S3
Platform --> Trino
Platform --> DH
Platform --> Mem
classDef default fill:#2F3640,stroke:#47515C,color:#EDF1F5
classDef accent fill:#2F3640,stroke:#4FC7E6,color:#EDF1F5
class Platform accent
obj · 01
Connects S3-compatible storage to MCP clients with read-only mode, size limits, prefix-based ACLs, and audit logging. Works with AWS S3, SeaweedFS, LocalStack, MinIO, or anything that speaks S3. Multi-account from a single installation.
sql · 02
Connects Trino to MCP clients with an optional semantic layer. Surfaces business descriptions, ownership, and quality scores from metadata catalogs alongside query results, and marks sensitive columns so an AI assistant knows what not to read. Multi-cluster from one install.
meta · 03
MCP server and Go library for DataHub. Search datasets, explore schemas, trace lineage, and read glossary terms, domains, and ownership. Ships as a standalone binary, a one-click Claude Desktop .mcpb bundle, or a composable library.
§ 02 / utilities
FWD-001 · go · kubefwd.com ↗
Develop locally, connect to Kubernetes by service name.
Bulk port-forwards every service in a namespace, assigns each a unique 127.x.x.x loopback IP, and writes the matching hostname entries into /etc/hosts. Your application's existing in-cluster connection strings (http://api-gateway:8080, redis-cli -h cache, mysql -h database) work unchanged on your laptop. Interactive TUI with live traffic, pod logs, and auto-reconnect on pod restart.
HST-002 · go · txeh.txn2.com ↗
Scriptable, thread-safe /etc/hosts management.
A Go library and CLI that originated as the substrate under kubefwd's hosts-file rewrites and grew into a standalone utility. Mutex-protected for concurrent use, supports IPv4 + IPv6, CIDR ranges, comment-based grouping, and dry-run rendering. Preserves comments and file formatting on existing lines.
§ 03 / other components
Further components published under the txn2 organization on GitHub.
HTTP reverse proxy that routes requests to backend ports specified in the URL path (/8081/foo → backend:8081/foo). Useful for exposing dynamic ports (NiFi listeners, webhook receivers) through a single Kubernetes ingress.
Reverse proxy that pre-validates JWTs against Keycloak (or any OIDC realm) and forwards parsed claims as HTTP headers. Backend services read user, roles, and realm-access from headers. No token-handling library required.
Kubernetes Admission Mutation Proxy. Forwards Pod admission reviews to a custom HTTP endpoint and applies the JSONPatch operations it returns. Originally built to inject per-user volumes and env vars into JupyterHub-spawned Pods.
Queue-based data collector with store-and-forward. Buffers HTTP POST data when downstream is offline, replays when it comes back. Built for IoT and edge collection where the network blinks.
Another static web server. Serves a directory and exposes its listing through a JSON REST API. Useful for download pages, asset catalogs, and any web app that wants to enumerate what's on disk without writing a backend.
Shared MCP Go library: interfaces, types, middleware patterns, and utilities. The substrate behind mcp-trino, mcp-datahub, mcp-s3, and any custom server that wants to drop into the same composable stack.
Full list of source repositories under the txn2 organization.
// about
Components developed by Craig Johnston, sponsored by Deasil Works, Inc. and Plexara. Released under the MIT or Apache 2.0 license.
